Sync terminal cached item counts to client

src/main/kotlin/net/shadowfacts/phycon/network/block/terminal/TerminalBlockEntity.kt

@@ -2,6 +2,7 @@ package net.shadowfacts.phycon.network.block.terminal
 
 import alexiil.mc.lib.attributes.item.GroupedItemInv
 import alexiil.mc.lib.attributes.item.ItemStackCollections
+import net.fabricmc.fabric.api.block.entity.BlockEntityClientSerializable
 import net.fabricmc.fabric.api.container.ContainerProviderRegistry
 import net.minecraft.entity.player.PlayerEntity
 import net.minecraft.inventory.BasicInventory
@@ -9,6 +10,7 @@ import net.minecraft.inventory.Inventory
 import net.minecraft.inventory.InventoryListener
 import net.minecraft.item.ItemStack
 import net.minecraft.nbt.CompoundTag
+import net.minecraft.nbt.ListTag
 import net.shadowfacts.phycon.api.packet.Packet
 import net.shadowfacts.phycon.api.util.MACAddress
 import net.shadowfacts.phycon.init.PhyBlockEntities
@@ -22,11 +24,14 @@ import net.shadowfacts.phycon.util.toTag
 /**
  * @author shadowfacts
  */
-class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), InventoryListener {
+class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), InventoryListener, BlockEntityClientSerializable {
 
 	private val inventoryCache = mutableMapOf<MACAddress, GroupedItemInv>()
+	val cachedNetItems = ItemStackCollections.intMap()
 	val internalBuffer = BasicInventory(18)
 
+	var counter = 0
+
 	init {
 		internalBuffer.addListener(this)
 	}
@@ -40,23 +45,32 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 
 	private fun handleReadInventory(packet: ReadInventoryPacket) {
 		inventoryCache[packet.source] = packet.inventory
-
-		println("new items: ${computeNetItems()}")
 	}
 
 	private fun handleDeviceRemoved(packet: DeviceRemovedPacket) {
 		inventoryCache.remove(packet.source)
 	}
 
-	fun computeNetItems(): Map<ItemStack, Int> {
+	private fun updateNetItems() {
-		val net = ItemStackCollections.intMap()
+		cachedNetItems.clear()
 		for (inventory in inventoryCache.values) {
 			for (stack in inventory.storedStacks) {
 				val amount = inventory.getAmount(stack)
-				net.mergeInt(stack, amount) { a, b -> a + b }
+				cachedNetItems.mergeInt(stack, amount) { a, b -> a + b }
 			}
 		}
-		return net
+	}
+
+	override fun tick() {
+		super.tick()
+		if (!world!!.isClient && (++counter % 20) == 0) {
+			updateNetItems()
+			sync()
+		}
+
+		if (world!!.isClient && (++counter % 20) == 0) {
+			println(cachedNetItems)
+		}
 	}
 
 	fun onActivate(player: PlayerEntity) {
@@ -85,4 +99,25 @@ class TerminalBlockEntity: DeviceBlockEntity(PhyBlockEntities.TERMINAL), Invento
 		internalBuffer.fromTag(tag.getList("InternalBuffer", 10))
 	}
 
+	override fun toClientTag(tag: CompoundTag): CompoundTag {
+		val list = ListTag()
+		tag.put("CachedNetItems", list)
+		for ((stack, amount) in cachedNetItems) {
+			val entryTag = stack.toTag(CompoundTag())
+			entryTag.putInt("NetAmount", amount)
+			list.add(entryTag)
+		}
+		return tag
+	}
+
+	override fun fromClientTag(tag: CompoundTag) {
+		val list = tag.getList("CachedNetItems", 10)
+		cachedNetItems.clear()
+		for (entryTag in list) {
+			val stack = ItemStack.fromTag(entryTag as CompoundTag)
+			val netAmount = entryTag.getInt("NetAmount")
+			cachedNetItems[stack] = netAmount
+		}
+	}
+
 }